A bibliography of water-resources investigations conducted by the U.S. Geological Survey, Water Resources Division in Puerto Rico and the U.S. Virgin Islands was compiled. The bibliography includes an alphabetical listing by author as well as listings by general and specific areas in Puerto Rico and the U.S. Virgin Islands. The publications are also classified by type of report: Open File, Open-File Data Report, KWater-Supply Paper, Water-Resources Investigations, and Professional Paper. (USGS)